http://blogs.technet.com/stefan_gossner/archive/2007/09/24/planning-updates-to-your-wss-moss-server-farm.aspxInstalling update (hotfixes, public updates, service packs) for WSS and MOSS can be a challenging tasks. Especially as a rollback in case that a problem occurs can be very expensive as it requires the restore of a backup as uninstall of hotfixes or serviceen-USCommunityServer 2.1 SP1 (Build: 61025.2)